linux/drivers/usb/dwc3/host.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * host.c - DesignWare USB3 DRD Controller Host Glue
   4 *
   5 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
   6 *
   7 * Authors: Felipe Balbi <balbi@ti.com>,
   8 */
   9
  10#include <linux/acpi.h>
  11#include <linux/platform_device.h>
  12
  13#include "core.h"
  14
  15static int dwc3_host_get_irq(struct dwc3 *dwc)
  16{
  17        struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  18        int irq;
  19
  20        irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
  21        if (irq > 0)
  22                goto out;
  23
  24        if (irq == -EPROBE_DEFER)
  25                goto out;
  26
  27        irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
  28        if (irq > 0)
  29                goto out;
  30
  31        if (irq == -EPROBE_DEFER)
  32                goto out;
  33
  34        irq = platform_get_irq(dwc3_pdev, 0);
  35        if (irq > 0)
  36                goto out;
  37
  38        if (!irq)
  39                irq = -EINVAL;
  40
  41out:
  42        return irq;
  43}
  44
  45int dwc3_host_init(struct dwc3 *dwc)
  46{
  47        struct property_entry   props[4];
  48        struct platform_device  *xhci;
  49        int                     ret, irq;
  50        struct resource         *res;
  51        struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
  52        int                     prop_idx = 0;
  53
  54        irq = dwc3_host_get_irq(dwc);
  55        if (irq < 0)
  56                return irq;
  57
  58        res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
  59        if (!res)
  60                res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
  61                                "dwc_usb3");
  62        if (!res)
  63                res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ, 0);
  64        if (!res)
  65                return -ENOMEM;
  66
  67        dwc->xhci_resources[1].start = irq;
  68        dwc->xhci_resources[1].end = irq;
  69        dwc->xhci_resources[1].flags = res->flags;
  70        dwc->xhci_resources[1].name = res->name;
  71
  72        xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  73        if (!xhci) {
  74                dev_err(dwc->dev, "couldn't allocate xHCI device\n");
  75                return -ENOMEM;
  76        }
  77
  78        xhci->dev.parent        = dwc->dev;
  79        ACPI_COMPANION_SET(&xhci->dev, ACPI_COMPANION(dwc->dev));
  80
  81        dwc->xhci = xhci;
  82
  83        ret = platform_device_add_resources(xhci, dwc->xhci_resources,
  84                                                DWC3_XHCI_RESOURCES_NUM);
  85        if (ret) {
  86                dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
  87                goto err;
  88        }
  89
  90        memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
  91
  92        if (dwc->usb3_lpm_capable)
  93                props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");
  94
  95        if (dwc->usb2_lpm_disable)
  96                props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");
  97
  98        /**
  99         * WORKAROUND: dwc3 revisions <=3.00a have a limitation
 100         * where Port Disable command doesn't work.
 101         *
 102         * The suggested workaround is that we avoid Port Disable
 103         * completely.
 104         *
 105         * This following flag tells XHCI to do just that.
 106         */
 107        if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
 108                props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");
 109
 110        if (prop_idx) {
 111                ret = device_create_managed_software_node(&xhci->dev, props, NULL);
 112                if (ret) {
 113                        dev_err(dwc->dev, "failed to add properties to xHCI\n");
 114                        goto err;
 115                }
 116        }
 117
 118        ret = platform_device_add(xhci);
 119        if (ret) {
 120                dev_err(dwc->dev, "failed to register xHCI device\n");
 121                goto err;
 122        }
 123
 124        return 0;
 125err:
 126        platform_device_put(xhci);
 127        return ret;
 128}
 129
 130void dwc3_host_exit(struct dwc3 *dwc)
 131{
 132        platform_device_unregister(dwc->xhci);
 133}
 134